Journal ArticleDOI
Hexylthiophene-Functionalized Carbazole Dyes for Efficient Molecular Photovoltaics: Tuning of Solar-Cell Performance by Structural Modification
Zhong-Sheng Wang,Nagatoshi Koumura,Yan Cui,Masabumi Takahashi,Hiroki Sekiguchi,Atsunori Mori,Toshitaka Kubo,Akihiro Furube,Kohjiro Hara +8 more
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TLDR
In this paper, the photovoltaic performance of dye-sensitized solar cells (DSSCs) was improved by adding n-hexyl chains to the thiophene groups.Abstract:
Novel organic dyes (MK dyes), which have a carbazole derivative as an electron donor and a cyanoacrylic acid moiety (═C(—C≡N)COOH) as an electron acceptor and an anchoring group, connected with n-hexyl-substituted oligothiophenes as a π-conjugated system, were designed and synthesized for application in dye-sensitized solar cells (DSSCs), which are one of the promising molecular photovoltaics. The photovoltaic performance of the DSSCs based on MK dyes markedly depends on the molecular structure of the dyes in terms of the number and position of n-hexyl chains and the number of thiophene moieties. Retardation of charge recombination caused by the existence of n-hexyl chains linked to the thiophene groups resulted in an increase in electron lifetime. As a consequence, an improvement of open-circuit photovoltage (Voc) and hence the solar-to-electric power conversion efficiency (η) of DSSCs was achieved upon addition of n-hexyl chains to the thiophene groups. In addition, the adsorption condition (amount of d...read more
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Journal ArticleDOI
Iterative Extension of Thiophene Ring Leading to Head-to-Tail-Type Oligothiophenes via Stepwise CH Arylation and Halogen Exchange Sequence
Shunsuke Tanba,Atsushi Sugie,Naoyuki Masuda,Daiki Monguchi,Nagatoshi Koumura,Kohjiro Hara,Atsunori Mori +6 more
TL;DR: In this article, the coupling reaction at the CH bond of thiophene with halo-thiophene occurs at the 5 position of 2-bromothiophene, with 2-iodithiophene in the presence of a palladium catalyst and AgN0 3 /KF as an activator.
Journal ArticleDOI
A dendron modified ruthenium complex: enhanced open circuit voltage in dye-sensitized solar cells.
TL;DR: The novel ruthenium complex RG1, bearing dendritic structures, can act not only as a dye but also as an additive in the electrolytes, leading to slow charge recombination and high open-circuit voltage even without 4-tert-butylpyridine in both iodine and cobalt electrolytes.
Journal ArticleDOI
Carbazole-based sensitizers for potential application to dye sensitized solar cells
Naresh Duvva,Ravi Kumar Kanaparthi,Jaipal Kandhadi,Gabriele Marotta,Paolo Salvatori,Filippo De Angelis,Lingamallu Giribabu +6 more
TL;DR: In this article, two push-pull molecules employing carbazole and alkyl thiophene (CAR-THIOHX) as donor moieties, with the cyanoacrylic group as the acceptor, have been designed and synthesized by simple organic transformations.
Book ChapterDOI
Nb2O5 dye-sensitized solar cells
Barbara N. Nunes,Leandro A. Faustino,Andressa V. Müller,André S. Polo,Antonio Otavio T. Patrocinio +4 more
TL;DR: In this paper, the application of Nb 2 O 5 thin films in dye-sensitized solar cells (DSSCs) is discussed and the main challenges to production of more efficient devices are highlighted.
Journal ArticleDOI
Molecular design of organic dyes with diketopyrrolopyrrole for dye‐sensitized solar cell: A theoretical approach
TL;DR: In this article, three metal-free dyes based on 3-(10-butyl-8-(methylthio)-10H-phenothiazin-3-yl)-2-cyanoacrylic acid (V5) are investigated by density functional theory (DFT) and time-dependent DFT to improve the efficiency of V5-based solar cell devices.
References
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Journal ArticleDOI
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
TL;DR: In this article, the authors describe a photovoltaic cell, created from low-to medium-purity materials through low-cost processes, which exhibits a commercially realistic energy-conversion efficiency.
Journal ArticleDOI
Conversion of light to electricity by cis-X2bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) charge-transfer sensitizers (X = Cl-, Br-, I-, CN-, and SCN-) on nanocrystalline titanium dioxide electrodes
Mohammad Khaja Nazeeruddin,Andreas Kay,I. Rodicio,Robin Humphry-Baker,E. Mueller,Paul Liska,Nick Vlachopoulos,Michael Graetzel +7 more
TL;DR: Cis-X 2 Bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) complexes were prepared and characterized with respct to their absorption, luminescence, and redox behavior.
Journal ArticleDOI
Light-Induced Redox Reactions in Nanocrystalline Systems
Anders Hagfeldt,Michael Graetzel +1 more
TL;DR: A review with 156 refs on interfacial electron transfer reactions in colloidal semiconductor solns and thin films and their application for solar light energy conversion and photocatalytic water purifn is presented in this paper.
Journal ArticleDOI
Solvatochromic Dyes as Solvent Polarity Indicators
TL;DR: In this paper, a review compiles positively and negatively solvatochromic compounds which have been used to establish empirical scales of solvent polarity by means of UV/vis/near-IR spectroscopic measurements in solution.
Journal ArticleDOI
Combined Experimental and DFT-TDDFT Computational Study of Photoelectrochemical Cell Ruthenium Sensitizers
Mohammad Khaja Nazeeruddin,Filippo De Angelis,Simona Fantacci,Annabella Selloni,Guido Viscardi,Paul Liska,Seigo Ito,Bessho Takeru,Michael Grätzel +8 more
TL;DR: The computed alignments of the molecular orbitals of the different complexes with the band edges of a model TiO(2) nanoparticle provide additional insights into the electronic factors governing the efficiency of dye-sensitized solar cell devices.